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TestDirector is a test management tool made by Mercury Interactive. Its four modules are: Requirements, Test Plan, Test Lab and the Defects Manager which are integrated to allow information to flow smoothly among various phases of the testing process. Completely Web-enabled, TestDirector supports communication and collaboration among the distributed testing teams. TestDirector has been categorized in the given classes: Defect Tracking Testing and ASQ (Analysis Debugging Automated Software Quality).

Can someone help me in finding out the right answer from the given options. The most significant characteristic of spiral model is: (1) Requirement analysis. (2) Configuration management. (3) Quality management. (4) Risk management.